Final answer:
Siddhartha Gautama, known as Buddha, attained enlightenment around 535 BCE and delivered his first sermon at Sarnath in an event known as Deer Park Discourse.
Explanation:
Buddha is a title that means 'the Enlightened One' given to Siddhartha Gautama, the founder of Buddhism, who attained enlightenment around 535 BCE. Tathagat is another term for Buddha. The event where Buddha delivered his first sermon at Sarnath is known as Deer Park Discourse.
Learn more about Buddhism here:
https://brainly.com/question/42648835
